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What is the purpose of fuel tank vents?
  • A
    To allow for fuel tank drainage and fuel sampling.
  • B
    To allow excess fuel to be removed.
  • C
    To prevent a vacuum forming in the tanks in flight.
  • D
    To prevent fuel freezing during flight at low temperatures.

Refer to figures.
FUEL VENT SYSTEM
Fuel tank vents allow air into the fuel tank to replace the volume of fuel consumed by the engine and to allow for equalization of pressure as the aircraft climbs or descends which helps to reduce evaporation and aids fuel transfer. This stops a small vacuum effect (suction) from occuring in the tank when the fuel is burnt in flight.

Fuel vents also usually use the speed of the airflow (ram effect) to provide a positive "head of pressure" on the fuel, to improve the performance of the initial fuel pumps and reduce the potential for cavitation.

  • When the fuel tanks are located in the wings, the fuel-tank vent will typically have a forward-facing ram tube or hole in the wing to provide ram airflow. The ram air intakes are located on the underside of the wing.

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